Why do we need measurements in physics
Current and voltage measurement
Current and voltage
We measure the current on an incandescent lamp. To do this, we connect it to a power supply unit.
What do we have to do if we want to increase the current in a lamp?
The electrical voltage is what drives the electrons. Therefore, the greater the electrical current in a circuit, the higher the voltage. The unit of voltage is the volt (from volta.
This is similar to water: the greater the water pressure on a pipe, the more water flows through it.
We measure the voltage at different voltage sources. To do this, we use batteries that we connect in series. This is also called series connection.
By connecting the batteries in series, we increase the electrical voltage.
How do you measure the voltage on a consumer in the circuit?
If we want to measure the voltage on a consumer, we have to connect the voltage measuring device in parallel to the consumer.
A small current flows through the measuring device. But in most cases this can be neglected.
The electrical voltage is a measure of the drive that electrons experience in a circuit. It is measured in volts. When measuring voltage, we do not need to open the circuit. We simply connect the voltage measuring device (voltmeter) in parallel to the consumer.
When batteries are connected in series, the voltages add up. The negative pole of one battery must always be connected to the positive pole of the following battery.
How does the current change when the voltage changes?
We measure current and voltage simultaneously on an incandescent lamp. We want to investigate how the current changes when the voltage is changed.
We connect the current measuring device (ammeter) in series to the consumer. On the other hand, we connect the voltage measuring device (voltmeter) in parallel to the consumer.
A small current flows through the voltmeter, otherwise we would not have a rash. However, this current is much less than the current that flows through the incandescent lamp.
The measurement result on the ammeter is slightly falsified.
Measurement on a resistor
What does electrical resistance mean?
If current flows through a metallic conductor, the free electrons move between the atoms of the conductor material. The atoms swing in all directions around their position of rest. This hampers the movement of the free electrons. Each conductor therefore opposes the electrical current with a resistance which the voltage has to overcome.
Here you will find a Overview of further articles on the subject of measurements in electric circuits, electromagnets,it also contains links to tasks.
These and other teaching materials are available in our shop packages with many PDF files from 1 euro and for teachers as WORD files that can be changed as required.
- How do pathogens affect animals
- Who is cricketer Virat Singh
- What is the saddest truth about poor people
- Why Indian openers fail in Australian series
- How can I register in WeChat
- How do you rate my body
- India secretly buys weapons from Israel
- What do people usually do in Scotland
- Which is better Lime Crime or ColourPop
- Why is ancient India so strongly underestimated
- How are IP addresses distributed
- Why do I always dream of snake
- Natural language processing APIs for common misspellings
- Who can learn Android apps development
- Is LED on the cutting edge of technology
- How do birds eat sunflower seeds
- What does BYOD
- What is stolen
- Why do we mostly use education
- Are there disagreements in libertarianism
- What would Hitler think of Antifa?
- When shouldn't you travel?
- How will my children call my niece
- Is biogas renewable
- What is the color of apple
- What is the drinking age in Jordan
- How can I beat the competition
- Who uses SockJS in production
- Why are guns bad
- Is experience more important than personality
- Will cryptocurrency ever make regular currencies irrelevant?
- How is the total enlargement calculated
- Can chloroplasts and mitochondria be prokaryotic